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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3ee8516f12299019f8812d98662ddfffd53a4b8ef71f5d8fe274ebb41254a5' 
  AND token = '5PEzKjwL2KxoYKdJ24diBLNRvltatPa/sJ2E29FyHO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}